Refactor sr_primitives. (#3214)

* refactor sr_primitives.

* Fix try build error.

* Line-width

* Ui test.

* Final fixes.

* Fix build again.

* bring back ui test.

* Fix unsigned import.

* Another ui fix.

* Also refactor substrate-primitives

* Fix benchmarks.

* Fix doc test.

* fix doc tests

substrate/core/sr-primitives/src/generic/digest.rs

@@ -105,7 +105,7 @@ pub enum DigestItem<Hash> {
 impl<Hash: Encode> ::serde::Serialize for DigestItem<Hash> {
 	fn serialize<S>(&self, seq: S) -> Result<S::Ok, S::Error> where S: ::serde::Serializer {
 		self.using_encoded(|bytes| {
-			::substrate_primitives::bytes::serialize(bytes, seq)
+			::primitives::bytes::serialize(bytes, seq)
 		})
 	}
 }

substrate/core/sr-primitives/src/generic/header.rs

@@ -48,7 +48,7 @@ pub struct Header<Number: Copy + Into<u128>, Hash: HashT> {
 
 #[cfg(feature = "std")]
 pub fn serialize_number<S, T: Copy + Into<u128>>(val: &T, s: S) -> Result<S::Ok, S::Error> where S: ::serde::Serializer {
-	use substrate_primitives::uint::U256;
+	use primitives::uint::U256;
 	let v: u128 = (*val).into();
 	let lower = U256::from(v as u64);
 	let upper = U256::from(v.rotate_left(64) as u64) << 64;

substrate/core/sr-primitives/src/generic/tests.rs

@@ -17,7 +17,7 @@
 //! Tests for the generic implementations of Extrinsic/Header/Block.
 
 use crate::codec::{Decode, Encode};
-use substrate_primitives::H256;
+use primitives::H256;
 use super::DigestItem;
 
 #[test]